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Two fuse wire of same length are rated 5 A and 20 A. Which of the two is thicker?
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Explain the meaning of the statement ‘the current rating of a fuse is 5 A’.
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‘A fuse is rated 8 A’. can it be used with an electrical appliance of rating 5kW, 200V?
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An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13 A.
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Name the quality which is measured in eV
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Name the quality which is measured in Wh.
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Name the quality which is measured in kW.
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Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their resistances.
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A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it.
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A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
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Is it possible that no transfer of energy may take place even when a force is applied to a body?
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The speed of light in air is 3 × 108 m s-1. Calculate the speed of light in glass. The refractive index of glass is 1.5.
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Name two places in india where electricity is generated from nuclear power plants.
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A uniform meter scale is in equilibrium as shown in the diagram :
(i) Calculate the weight of the meter scale.
(ii) Which of the following options is correct to keep the ruler in equilibrium when 40 gf wt is shifted to 0 cm mark ?
F is shifted towards 0 cm
or
F is shifted towards 100 cm
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(i) Write one advantage of connecting electrical appliances in parallel combination.
(ii) What characteristics should a fuse wire have ?
(iii) Which wire in a power circuit is connected to the metallic body of the appliance ?
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What is meant by a rotatory motion? Give one example.
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State the factors on which moment of force about a point depends.
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What do you understand by the clockwise and anti clockwise moment of force?
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State the condition when a force produces
(i) linear motion.
(ii) rotational motion, in a body.
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What do you mean by equilibrium of a body?
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